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Segment Information - Summary of Reportable Segments (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of reportable segments [line items] |  |  |
Net sales | kr 247,880 | kr 263,351 | kr 271,546
Gross income | 109,365 | 101,602 | 113,295
Earnings (loss) before financial items and income tax (EBIT) | 4,313 | (20,326) | 27,020
Financial income and expenses, net | (1,724) | (2,993) | (2,411)
Income (loss) after financial items | 2,589 | (23,319) | 24,609
Income tax | (2,215) | (2,785) | (5,497)
Net Income (Loss) | 374 | (26,104) | 19,112
Other segment items |  |  |
Share in earnings of associated companies | (246) | 124 | 17
Impairment losses | (99) | (154) |
Restructuring charges | (5,012) | (6,521) | (399)
Networks [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 158,207 | 171,442 | 193,468
Cloud Software and Services [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 62,635 | 63,630 | 60,524
Enterprise [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 24,863 | 25,745 | 14,597
Segment information [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 247,880 | 263,351 | 271,546
Gross income | kr 109,365 | kr 101,602 | kr 113,295
Gross margin | 44.10% | 38.60% | 41.70%
Earnings (loss) before financial items and income tax (EBIT) | kr 4,313 | kr (20,326) | kr 27,020
EBIT margin | 1.70% | (7.70%) | 10.00%
Financial income and expenses, net | kr (1,724) | kr (2,993) | kr (2,411)
Income (loss) after financial items | 2,589 | (23,319) | 24,609
Income tax | (2,215) | (2,785) | (5,497)
Net Income (Loss) | 374 | (26,104) | 19,112
Other segment items |  |  |
Share in earnings of associated companies | (246) | 124 | 17
Amortizations | (3,980) | (4,458) | (3,577)
Depreciations | (6,040) | (6,699) | (6,565)
Impairment losses | (15,714) | (32,732) | (401)
Restructuring charges | (5,012) | (6,521) | (399)
Gains/losses on sale of investments and operations | (145) | (285) | 256
Segment information [member] | Networks [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 158,207 | 171,442 | 193,468
Gross income | kr 73,648 | kr 67,959 | kr 86,368
Gross margin | 46.60% | 39.60% | 44.60%
Earnings (loss) before financial items and income tax (EBIT) | kr 25,665 | kr 19,382 | kr 38,512
EBIT margin | 16.20% | 11.30% | 19.90%
Other segment items |  |  |
Share in earnings of associated companies | kr 94 | kr 83 | kr 30
Amortizations | (1,288) | (1,013) | (1,424)
Depreciations | (4,187) | (4,460) | (4,073)
Impairment losses | (305) | (527) | (211)
Restructuring charges | (1,899) | (4,437) | (146)
Gains/losses on sale of investments and operations | (7) | (24) | 253
Segment information [member] | Cloud Software and Services [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 62,635 | 63,630 | 60,524
Gross income | kr 23,021 | kr 22,088 | kr 20,106
Gross margin | 36.80% | 34.70% | 33.20%
Earnings (loss) before financial items and income tax (EBIT) | kr (435) | kr (220) | kr (1,689)
EBIT margin | (0.70%) | (0.30%) | (2.80%)
Other segment items |  |  |
Share in earnings of associated companies | kr 2 | kr 41 | kr 27
Amortizations | (30) | (43) | (122)
Depreciations | (1,381) | (1,470) | (1,792)
Impairment losses | (87) | (176) | (91)
Restructuring charges | (2,434) | (1,924) | (96)
Gains/losses on sale of investments and operations | 10 | (39) | 0
Segment information [member] | Enterprise [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 24,863 | 25,745 | 14,597
Gross income | kr 12,788 | kr 12,016 | kr 7,096
Gross margin | 51.40% | 46.70% | 48.60%
Earnings (loss) before financial items and income tax (EBIT) | kr (22,083) | kr (38,336) | kr (4,473)
EBIT margin | (88.80%) | (148.90%) | (30.60%)
Other segment items |  |  |
Share in earnings of associated companies | kr 0 | kr 0 | kr 0
Amortizations | (2,661) | (3,401) | (2,019)
Depreciations | (274) | (274) | (515)
Impairment losses | (15,308) | (31,952) | (87)
Restructuring charges | (511) | (173) | (65)
Gains/losses on sale of investments and operations | (165) | (16) | 111
Segment information [member] | Others [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 2,175 | 2,534 | 2,957
Gross income | kr (92) | kr (461) | kr (275)
Gross margin | (4.20%) | (18.20%) | (9.30%)
Earnings (loss) before financial items and income tax (EBIT) | kr 1,166 | kr (1,152) | kr (5,330)
EBIT margin | 53.60% | (45.50%) | (180.30%)
Other segment items |  |  |
Share in earnings of associated companies | kr (342) | kr 0 | kr (40)
Amortizations | (1) | (1) | (12)
Depreciations | (198) | (495) | (185)
Impairment losses | (14) | (77) | (12)
Restructuring charges | (168) | 13 | (92)
Gains/losses on sale of investments and operations | kr 17 | kr (206) | kr (108)

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